Linking agricultural practice to insect and bird populations: a historical study over three decades

Timothy Guy Benton, D. M Bryant, L. Cole, H. Q. P. Crick

    Research output: Contribution to journalArticle

    354 Citations (Scopus)

    Abstract

    1. There is continuing debate about the impact of agricultural practices on farmland wildlife. In particular, it has been postulated that a general decline in insect abundance linked with intensification of agriculture may have contributed to farmland bird decline. While some autecological studies have supported this hypothesis, larger-scale and long-term studies are needed.

    2. Suction traps mounted on 12.2-m towers (Rothamsted-type) have been sampling aerial insects for nearly 40 years throughout the UK. Their catches are correlated over large spatial scales. We analysed insect catch data from a single suction trap run for 27 years in a rural location in Scotland, and showed that insect numbers have changed significantly over time, although non-linearly. The multivariate data set (numbers from the 12 common arthropod groups) was summarized using principal components analysis (PCA) to extract three components explaining 62% of the variation.

    3. We also used PCA to describe agricultural change, using published agricultural data for eight measures of farming in Scotland. Arthropod abundance and principal component (PC) scores were significantly related to the agricultural PC scores as well to summary climatic measures.

    4. Using Scottish data from the British Trust for Ornithology Common Birds Census, we extracted three PC to describe the time-dependent average densities of 15 common farmland birds in Scotland. Measures of bird density were significantly related to insect abundance and PC scores and, independently, to measures of agriculture and climate.

    5. These data from a broad suite of species provide support for linked temporal change between farmland birds, invertebrate numbers and agricultural practice in Scotland. Although entirely correlative, the results are consistent with the view that agricultural change has influenced birds through changes in food quality or quantity. The work also shows how large-scale invertebrate sampling, in this case using suction traps, is useful for monitoring farmland biodiversity.

    Original languageEnglish
    Pages (from-to)673-687
    Number of pages14
    JournalJournal of Applied Ecology
    Volume39
    DOIs
    Publication statusPublished - 2002

    Keywords

    • farming
    • farmland
    • generalized additive models
    • population trend
    • suction trap
    • CHOUGH PYRRHOCORAX-PYRRHOCORAX
    • FARMLAND BIRDS
    • SOUTHERN ENGLAND
    • VANELLUS-VANELLUS
    • HABITAT SELECTION
    • BREEDING SUCCESS
    • ABUNDANCE
    • TRENDS
    • FOOD
    • SURVIVAL

    Cite this

    Linking agricultural practice to insect and bird populations: a historical study over three decades. / Benton, Timothy Guy; Bryant, D. M; Cole, L.; Crick, H. Q. P.

    In: Journal of Applied Ecology, Vol. 39, 2002, p. 673-687.

    Research output: Contribution to journalArticle

    Benton, Timothy Guy ; Bryant, D. M ; Cole, L. ; Crick, H. Q. P. / Linking agricultural practice to insect and bird populations: a historical study over three decades. In: Journal of Applied Ecology. 2002 ; Vol. 39. pp. 673-687.
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    AU - Bryant, D. M

    AU - Cole, L.

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    AB - 1. There is continuing debate about the impact of agricultural practices on farmland wildlife. In particular, it has been postulated that a general decline in insect abundance linked with intensification of agriculture may have contributed to farmland bird decline. While some autecological studies have supported this hypothesis, larger-scale and long-term studies are needed.2. Suction traps mounted on 12.2-m towers (Rothamsted-type) have been sampling aerial insects for nearly 40 years throughout the UK. Their catches are correlated over large spatial scales. We analysed insect catch data from a single suction trap run for 27 years in a rural location in Scotland, and showed that insect numbers have changed significantly over time, although non-linearly. The multivariate data set (numbers from the 12 common arthropod groups) was summarized using principal components analysis (PCA) to extract three components explaining 62% of the variation.3. We also used PCA to describe agricultural change, using published agricultural data for eight measures of farming in Scotland. Arthropod abundance and principal component (PC) scores were significantly related to the agricultural PC scores as well to summary climatic measures.4. Using Scottish data from the British Trust for Ornithology Common Birds Census, we extracted three PC to describe the time-dependent average densities of 15 common farmland birds in Scotland. Measures of bird density were significantly related to insect abundance and PC scores and, independently, to measures of agriculture and climate.5. These data from a broad suite of species provide support for linked temporal change between farmland birds, invertebrate numbers and agricultural practice in Scotland. Although entirely correlative, the results are consistent with the view that agricultural change has influenced birds through changes in food quality or quantity. The work also shows how large-scale invertebrate sampling, in this case using suction traps, is useful for monitoring farmland biodiversity.

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    KW - farmland

    KW - generalized additive models

    KW - population trend

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    KW - CHOUGH PYRRHOCORAX-PYRRHOCORAX

    KW - FARMLAND BIRDS

    KW - SOUTHERN ENGLAND

    KW - VANELLUS-VANELLUS

    KW - HABITAT SELECTION

    KW - BREEDING SUCCESS

    KW - ABUNDANCE

    KW - TRENDS

    KW - FOOD

    KW - SURVIVAL

    U2 - 10.1046/j.1365-2664.2002.00745.x

    DO - 10.1046/j.1365-2664.2002.00745.x

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    JO - Journal of Applied Ecology

    JF - Journal of Applied Ecology

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    ER -